kmalloc() may fail, so test whether it succeeded.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Wei Yongjun <yjwei@cn.fujitsu.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/scsi/scsi.c

@@ -1057,6 +1057,8 @@ unsigned char *scsi_get_vpd_page(struct scsi_device *sdev, u8 page)
 
 	kfree(buf);
 	buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return NULL;
 	result = scsi_vpd_inquiry(sdev, buf, page, len);
 	if (result)
 		goto fail;